# Relationship history for MSHA mine 1516677

Current hierarchy: **Gary N  Boyd → Cowan Branch Coal Company Inc → #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Gary N  Boyd → #2; 1986-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Targan Coal Company → #2; 1989-07-01 to 1990-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Ronald Jr → #2; 1989-07-01 to 1990-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Ronald Jr → Targan Coal Company; 1989-07-01 to 1990-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Cowan Branch Coal Company Inc → #2; 1990-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary N  Boyd → Cowan Branch Coal Company Inc; 1990-06-04 to current/open; source msha-controller-operator-history